Railway-car brake.



s'iwrns rarnirr oriucn STONEWAL: TOMPKINS, F BROOKLYN, NEW YORK,

Specification of Letters Patent.' Appiicatimi medirarciiee, 1913.

RAJLWAY-CAR BRAKE.

Patented Aug., 25, 19M, semina. 757,033.

To all @fiom t may concern:

Be it known that il, STONEWALL 'Torreiriivs, a citizen of the United States, residing 'at Brooklyn, in the county of Kings and State lof `-New York, have invented certain.

new anduseul Improvements in Railway-A l Car Brakes, of which the following is ai specification.

v This invention -relates to railway carf bra-kes of the type employing a lever to;

'which power is .applied and from which:

power is transmitted tothe bra-ke to be op-v ei-ated,}ancl has 'for its object to so construct 'the lever' 'that its point of transmission g -motion of point -fle'ss than 9015;. degrees f ti'nually inc i nieves iii-an arc 'such that the direction of u the V be ng taken shalllbe at an angle of,l from the direction off force transmitted, during the first part"v braking movement when the slack is f u-p but which anle shall contoward 9G degrees asp-the;

braking pressure is increased, thereby per-l iiit'ting not only quick application of the brakes with ya minimum/range of operating? esl movement, but insuring veloping the actual-braking pressure; said brake lever being preferably constructed to cause its power receiving point to niove in ran arc such that the the point shall be at v, last named .much greater radius ample power in dei direction of ino-tion of; an angle of less than 90 I degrees from the direction of the force received, said angle to continually decrease tol wardO degrees, orevcii to a negative value,

as braking pressure is increased, and said arc also point of transmission.

According to the preierred embodiment of theinvention herein disclosed for purposes of illustration, the generalposition of the new construction of lever is approximately perpendicular to the line of application of power, when the full braking pressure is being applied, but the lever is de-l flected so as to provide two legs, one of preferably hav-ing ai" than the arc of the .vhich, extending from tlie-fulcrum to the' power transmission point, is1 at a considerable angle to the perpendicular referred to, so that the arc ofits movement, while commencing substantially in line with the direction of power transmission or at an angle thereto of less than 90 degrees, will gradually assume a direction at a greater angle thereto, -while theother leg extends .from

said point of transmission to the pointl -rliichpower is applied, which latter is in.

`such for instance Aas the a radius which, in the operation of the brake, may sweep across the perpendicular to the line-:off transmission and thus develops an arc of movement which is mainly coinsident with lthe direction of' power transmission. The lever is rendered duplex by pro viding two, symmetrically deflected members .on opposite sides of its fulcrum.

In the accompanying drawing,"Figure l is a side elevati-on of adouble-truck brake system inwh-ich the present invention may be advantageously employed, and Fig. 2 is a plan view of the brake rigging,

l, la, represent brake rods adapted to be connected to the brakes to lac-applied, as for instance through the mediumfof chains lb, lo, o-r-other liC-lerible means andthe yolies 2, 2a which receive at their ends, the brake levers '8, 3a'con-nected with the brake shoes Il, 4a; and 5, 5a represent draft rods through which to apply the braking' power, developed .at any suitable source, as for instance the winding staffs 6, 6a neet-ions 7, 7a.

The subject of the present invention con- -sfists of a new for-m oflever for transmitting the Lbraking power, as lfor instance, from a dra/tt rod to a -brakerod l, or communieating power between a plurality of suoli rods. For this purpose, l employ a lever,

lever 8 having a fffulcrum 9, with a hub o-r cylindrical flange at 9"?, a power transmitting point l0 receiving the 'brake connection, as for instance :the chain lb of rod l, and a" power receiving point ll, receiving the applying connection, as for instance rod '5. The purpose of this construction is to prevent the occurrence of avdead center when the brake is applied so. that the chains l-b, lc will be wound around the hub part 9b, providing a leverage or" constant radius.

The lever 8 is so constructed that4 the radius of its power receiving point at the time of application of full braking pressure will be approximately perpendicularto the direction in which' poweris applied to it,

' while the radius of its power transmitting point'is at the same-time at a considerable angle to the direction in which power is transmitted fromit. To thesey ends, when the 'lever'is of the second order as shown and' when thedirections in which the lever receives and transmits itspower are approximately parallel, the-level is deflected so as topprovide' two legs, vnamely, one extending fromitlie'fulcrum in sucndirection as to establish the transmission point in a radius at a considerable angle to the perpendicular, and the other extending from Atransmission. point 10 in suclrdirection as to bring the receiving point back into the perpendicular or 'approximately so. l

lVhen movement is imparted to lever 8, the radius of receiving point 11 sweeps up to.or. across the-perpendicular to the direc-` tion of application of power and full efficiencyof the from af vposition in which it is enabled to promptly take up slack in the connections, but by the. time the bra'ke 'shoes have begun to press the wheels, the mint-10 has reached the portion of its are o movement where a great increase of pressure develops. By symmetrically but oppositely deflecting ends 8, StL of a longer'lever and thereby duplicating the conditions described,l onfopposite sides of the fulcrum, transmission point 10a and receiving point 11a are provided for operating rod 5a and brakerod 1a, and the lever is thi ,"made to realize the advantages referred to, in a duplex vbrake system capable of serving two sets of wheel brakes simultaneously, and of being operated from either end of thev car at will. In'sucli an arrangement, the particular operating rod (5 or 5a) utilized7 operates on one brake rod,witli a leverage of second order and on the'other brake rod with an equal leverage of the rst order.

To equalize braking pressure at opposite fulcrum 9 has so that lever 8,

ends of suchduplex system, bearing in a slotted hanger 9X lSa is floating.

[claim:--,` l 1. In a car brake lever fulcrumed in the car; a draft rod hinged at the extreme end power. is maintained; but in. this movement, `the are of point 10 starts,

dicular between of said lever and suitably operated from the car, said' extreme end of the lever situated tol travel toward the perpendicular between the draft rod and said lfulcriim during action; a power transmitting member journaled to saidleve-r on one. side of its lfulcruni, the portion of said member adjacent said lever being flexible; a hub on said lever coaxial with said fulcrum; the journal point for said member being situated'radially re' moved from said hub and in a position to travel away from the perpendicular between' said draft rod and said fulcrum lthe flexible port-ion of said hub during the latterpart of action. 2. In acar brake an S- haped lever fulsaid member being wound aroundcrumed at its center in the car; a draft rod hinged at each of the extreme lever and suitably operatedy from the car, said' extreme ends of the lever situated to travel toward the perpendicular between the draft rods during action; transmitting members` journaled to said S-i shaped lever symmetrically on eitherside of its fulcrum, the portion of said members adjacent said lever being flexible; acentral hubon said lever coaxial with said fulcrum; the journal points situated radially' removed from said hub andv in a position to travel away from the-perpensaid draft rods, and flexible portion of said members being wound around said hub action.

lThe foregoing specification signed at Brooklyn, New York, this 8th day of Jan uaiy, 1913.

STGNEVALL TOMPKINS. Alnpresence of two witnesses ,j K. A. RILEY,

R. A. PAiNE, J r.

for said members beingy the duringthe latter part of ends 'of saidV a pair of power .j 

